The US-Mexico border was rocked by a magnitude-5.7 earthquake Monday night. The U.S. Geological Survey (USGS) said the quake was centered five miles southeast of Ocotillo in Imperial County - about 85 miles east of San Diego. It struck Monday at 9:26 p.m. The quake was an aftershock of the deadly Sunday magnitude-7.2 quake that shook Baja California and Southern California, said Egill Hauksson, a seismologist at the California Institute of Technology in Pasadena. He said the epicenter of Monday's quake occurred in the same zone of the quake in April. "Aftershocks can go on for months and years," he said. Thousands of aftershocks have occurred since the Sunday earthquake. More than 100 aftershocks were recorded immediately following Monday's 5.7 quake, with the largest measuring at magnitude-4.5. San Diego County Office of Emergency Services had no reports of significant damage. Louis Fuentes, chairman of the Imperial County board of supervisors, also said he had no immediate reports of damage.
